Solution for a lot of crashes caused by the lack of pointer validation.

[holonowp]

Hello everyone,
With using ELPP I have experienced crashes caused by the lack of pointer validation. They occur always when you try to use the logger at:

1. The constructor of a static object (as the trial to log occurs before initializing the storage),
2. The destructor of a static object (logging after the storage has been destroyed).
   and sometimes in other circumstances as well (multiple threads, etc).
   The reason is unfortunately a wide use of the expressions like ELPP->registered_loggers()-> and similar ones, without checking the pointers first.
   I have fixed this problem in my local copy, how can I fix the repository, so everyone could benefit ?